Improvement in doors



J'. C. CARRERA, J'. SALVATELLI & A. GRAZIANAI.

INVENTHS N. PETERS. PHoTo LITHOGRAPHER WASH NGTON D C UNITED S'rA'rEs FFIGE JULIUS CARRERA, JOHN SALVATELLI, AND ALEXANDER GRAZIANI, OF

' ST. LOUIS, MISSOURI.

IMPROVEMENT IN DOORS.

Specification forming part of Letters Patent No. ISO,544, dated August 1, 1876; application filed May 16, 1876.

To all whom it 'may concern:

Be it known that we, J ULIUs OJESAR OAR- EERA, JOHN SALvA'rELLL'and ALEXANDER GRAZIANI, all of the city and county ot' St. Louis and State of Missouri, have invented certain Improvements in Doors, which improvement is fully set forth in the following` specication, reference being had to the accompanyin g drawings.

Our improvement relates to those doors which are supported by vertical bolts, serving as pivots on which the door is adapted to swing.

Our invention consistsin providing such a structure with a horizontal bar adapted to lock either set of bolts, so as to prevent both sides of the door from being` freed at the saine time.

Figure lis one-half in elevation and onehaltl in section, the lintel and threshold being in section. Fig. 2 is a top view, showing the door-posts in section, level with the top of the door. Fig. 3 is an enlarged detail showing the upper end of one oi' the bolts in side view. Fig. et is a top view (enlarged) ot' part of one ofthe plates, in which the bolts have bearing. Fig. 5 shows in side view the upper bolt upon the opposite side of the door to Fig. 3. Fig. 6 is a top view of one of the bolts and connections.

A is the threshold 5 B B, the side posts; and C, the lintel. D is the door. The t'hreshold has at each end a socket to receive the end of a vertical bolt. These sockets may be ixed, or may be made in the free plate ot'a hinge, as shown in Fig. 2, so as to allow them to be movable to enable the door to swing` in both directions, when it is made to lit tight between the posts or stiles, as will be more fullydescribed hereinafter.

Ateach edge of the door are vertical bolts E and F, the lower bolt E engaging in a socket beneath, in which it may turn when it acts as a hinge for the door, and the upper bolt engaging and turning in a similar socket above.. These bolts are secured to the opposite ends of a cross-bar, G, on a spindle, H, turned by a handle, I, to retract the bolts from their socketse and f. The bolts are held in their sockets by springs J.

It will be observed that if the bolts E F upon one side are drawn from their sockets the bolts upon the other side will act as hinges 0n which the door may be opened.

It is considered better that when one pair of bolts E F are retracted the other pair upon the other side of the door shall be unretractible. so as to prevent the door being accidentally thrown down. To accomplish this a horizontal bar, K, passes through the door, so that when either of the cross-bars G is turned to retract the bolts the bar rests against the other cross-bar, and prevents the other cross-bar from being turned for this purpose.

In addition to this I place at the upper ends of the bolts F side lugs, which extend above the socket plate and prevent the retraction of the bolt F, when the door is. not closed. When the door is closed the lug may be drawn down through the notch f directly beneath it.

As a modification of the bar K we provide for the bolt E upon one side ot' the door, and the bolt F upon the other side, bell-cranks L, which are moved by the retraction of the bolt, and which thrust out by such movelnent bolts M to engage in notches Nin the opposite bolts E or F, and thus preventv the retraction of the bolts upon the opposite sides of the door.

When the door is titted closely in the posts upon both sides it will be necessary that the turning-points of the bolts shall be placed tlush with or a little outside the face of the door, so as to allow it toopen well back.

When, in addition to this, the doorl is intended to open both outwardly and inwardly, the sockets c and f must be made at the free end of the moving leafo ofa hinge, O, whose pintle is at the opposite face ofthe door from- JULIUS CZESAR CARRERA. JOHN SALVATELLL ALEXANDER GRAZIANI.

Witnesses SAML. KNIGHT, ROBERT BURNS. 

